About custom domains and GitHub Pages - GitHub Docs
https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/about-custom-domains-and-github-pages
WEBGitHub Pages supports using custom domains, or changing the root of your site's URL from the default, like octocat.github.io, to any domain you own. Who can use this feature? GitHub Pages is available in public repositories with GitHub Free and GitHub Free for organizations, and in public and private repositories with GitHub Pro, GitHub Team ...
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